Depending on the type of potato (variety) they may or may not freeze ok. I have frozen soups- chicken and beef with potato in them- and the potato got... funny for lack of a better word- don't want to exactly say mushy, but the texture definately changed in a NOT appealing way. However, I have frozen a cheesey potato casserole I made with YUKON GOLD potatoes- and it reheated wonderfully with no change in the texture of the potatoes.
So my suggestion is put the potatoes in a cool dark place- basement, garage, think I read somewhere even under the bed works- be sure they can get air circulation. They should keep a good long time that way (my parents kept their harvest most of the winter by placing in a box in the basement. My mother in law keeps potatoes she has bought in the crisper drawer of a fridge- if you have room that works too.
Otherwise, make a small batch of something, eat some and freeze a small amount to see if these potatoes freeze well- if they do, go for it, if not,....
Brenda